A nut, flat on top and bottom having 6 flat sides. For items which have internal tapered or straight (parallel) pipe threads, specific electrical conduit size designation, and which when installed, provide a method of tightening to lock the connection, see locknut, electrical conduit. See also locknut, tube fitting. For items having a thickness (or height) exceeding two times the width across the flats, use post, electrical-mechanical equipment. (when height or thickness and/or width across the flats is designated as a tolerance dimension, the maximum dimension will be used to determine compliance.)
NSN
NSN 6220-01-304-7500
NSN 6135-01-432-6201
NSN 5985-01-351-2964
NSN 5998-01-632-2260
NSN 5915-00-186-9346
NSN 6110-01-511-0201
NSN 2925-00-964-7128
NSN 5950-00-099-1046
NSN 6150-00-559-8369
NSN 6135-01-440-9412
NSN 6320-01-504-3948